MONOGRAPH OF THE EXISTING CRINOIDS. 371 



It appears, therefore, that sexual maturity is reached at about the middle of 

 October, and that the discharge of the sexual products takes place very quickly. 



In the case of Tropiometra ma^rodiscus Mr. Aoki found that the period of 

 sexual maturity had passed at the end of October. 



COMANTHUS ANNULATA. 



Dr. L. E. Griffin reports that in a specimen of this species captured at Port 

 Galera, Mindoro, PhiliiDpines, on May 20, 1912, spermatozoa were being given off 

 from near the base of the pinnules. 



CATOlTOaiETKA OPIIirRA. 



In a specimen dredged in North Balabac Strait, Philippine Islands, at a depth 

 of 58 fathoms, on January 5, 1909, the ovaries contained well-developed eggs. 



AMPHIMETRA SPECTABILIS. 



The ovaries of a specimen taken in Limborres Cove, Manila Bay, Philippine 

 Islands, on February 8, 1909, contained well-developed eggs. 



AMl'HniETKA FAKILIS. 



Eggs of considerable size were found in the ovaries of a specimen dredged 

 near Siasi, in the Sulu (Jolo) Archipelago. Philippine Islands, at a depth of 21 

 fathoms, on Februai'y 16, 1908. 



CENOMETRA nELIC.\TA. 



A specimen dredged in the Gulf of Davao, Philippine Islands, in 23 fathoms, 

 on May IS, 1908, has eggs of considerable size in the ovaries. 



TROPIOMETRA MACRODISCUS. 



Mr. Furusawa, under the direction of Professor Ijima, prepared a large series 

 of the embryos of this species for Mr. Frank Springer. 



The mother animal from which these embryos were obtained discharged the 

 eggs on September 10, 1917. 



TROPIOJIETRA PICTA. 



Doctor Mortensen found this species spawning at Tobago during his visit to 

 the island, from March 23 to April 23. 1916. 



CALTPTOMETKA LATERALIS. 



A specimen dredged near Niihau, Hawaiian Islands, at a depth of 319—151 

 fathoms, on August 12, 1902, had eggs of considerable size in the ovaries. 



ANTEDON BIFIDA. 



Orkneys: Busch first found larva? in the Orkneys in the last days of July. 

 Arran, Scotland: Sir Wj'ville Thomson saj-s that on the island of Arran the 

 spawning season commences at the end of May or the beginning of June. 



